Arm chair



FIG. 1 is a front perspective view of an armchair showing my design on a reduced scale;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an arm chair, as shown and described. 